[Xylakant]

The device is described as using a gyroscope to measure movement, so it would be independent of wheel diameter and grip. Gyroscopes still drift, so occasional calibration against an absolute position source is still required.

[kube-system]

The device uses a gyroscope to determine direction. But a gyroscope is unable to measure distance travelled. So this device also attaches to the transmission to determine distance.

> A special servo gear was also attached to the transmission housing to feed information to the Gyro-Cator to help maintain position, map speed and distance traveled.